EUP2573 ds2573 ver0.2 mar. 2012 1 1.2mhz step-up pwm controller description the EUP2573 is a compact, high efficiency, fixed frequency pulse-width-modulation (pwm) controller. it provides an easy-to-use power supply solution fo r the application from one li-ion battery to 5v outpu t. all compensation and protection circuitry are integrated to minimize external components. the 1.2mhz high switching frequency allows smaller inductor and output capacitor, making the EUP2573 ideally suited for small battery-powered applicatio ns and saves pcb space. the EUP2573 contains thermal shutdown function and output short protection circuit. built-in soft-star t circuitry prevents excessive inrush current during start-up. the EUP2573 is available in a pb-free, thin-sot23-5 package. typical application circuit features v dd range: 2.7v to 5.5v high efficiency up to 90% 1.2mhz fixed switching frequency tiny external components output short protection <1 a shutdown current 3.3v to +5.0v distributed power supply single cell li-ion battery to 5v converter available in sot23-5 package rohs compliant and 100% lead (pb)-free halogen-free applications one li-ion battery to 5v output handheld devices figure 1. connecting vdd to v in
EUP2573 ds2573 ver0.2 mar. 2012 2 typical application circuit (continued) figure 2. connecting vdd to v out pin configurations package type pin configurations sot23-5 pin description pin sot23-5 description 1 en enable input. en is an active high asserted input. set en lower than 0.4v will disable EUP2573. 2 gnd ground. 3 ext output of mosfet gate driver. connect this pin to t he gate of the external mosfet. 4 vdd power input. connect vdd to the input power supply or to the output of the regulator. 5 fb feedback pin.
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